Article
Article name Investigation of Acid Dezolization Process of Graphitized Metallurgical Dust Flotation Concentrate
Authors Orekhova , N.N. doctor of technical sciences, associate professor, n_orehova@mail.ru
Fadeeva N.V. candidate of technical sciences, associate professor, natali_fadeeva@mail.ru
Zinchenko A.A. 4th year student, Geology, Surveying and Mineral Processing department, isaeva.ls@mail.ru
Isaeva L.S. 2nd year student, Geology, Surveying and Mineral Processing department, andrej-zinchenko@list.ru
Bibliographic description Orehova N. N., Fadeeva N. V., Zinchenko A. A., Isaeva L. S. Investigation of acid dezolization process of graphitized metallurgical dust flotation concentrate // Transbaikal State University Journal. 2023. Vol. 29, no. 4. P. 73–84. DOI: 10.2109/2227-9245-2023-29-4-73-84.
Category Subsoil Use, Mining Sciences
DOI 622.7/622.234.42
DOI 10.2109/2227-9245-2023-29-4-73-84
Article type Original article
Annotation Promising raw materials for the production of flake graphite are graphitized dust from the metallurgical processing of iron ores. The problem of obtaining low-ash graphite from spel is associated with the search for an effective method for deashing flotation concentrates. The purpose of the work is to experimentally test the possibility of effectively reducing the ash content of flotation concentrate by chemical finishing with acid leaching. The object of the study is a flotation concentrate obtained from graphitized smelt of an oxygen converter shop. The objective of the study is to select an acid deliming method for further optimization of the process. The article provides information on the results of purification of natural graphite by treatment with solutions of individual acids and their mixtures by foreign researchers. The differences in the compositions of natural and technogenic graphite, which determine the choice of the method of acid leaching of ash components, are considered. A thermodynamic justification for the choice of a combination of hydrofluoric and sulfuric acids is given. The results of one-factor experiments on processing the concentrate with leaching solutions of hydrochloric, sulfuric, nitric and hydrofluoric acids and the results of an optical microscopic study of deashed graphite are presented. The dependences of the influence of the type of acid, the duration of leaching and the concentration of the solution on the leaching parameters are presented and analyzed. Optical microscopic analysis confirmed the effectiveness of using hydrofluoric acid for deashing graphite. It has been established that the addition of hydrofluoric acid to a 10 % solution of sulfuric acid in an amount of 0.5 relative% improves deashing performance. The ash content of the graphite concentrate after 90 minutes of contact with the complex leaching solution was reduced from 22.0 to 12.45 %. Further reduction of ash content without additional disintegration is difficult due to the presence of ash iron-oxygen inclusions in the interlayer space of technogenic graphite particles.
Key words technogenic raw materials, metallurgical dust, flake graphite, flotation concentrate, leaching parameters, ash content, hydrochloric acid, sulfuric acid, nitric acid, hydrofluoric acid, acid combinations
Article information
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